(under the class definition) Apparatus comprising a supporting or carrying means insertable in an inaccessible hole, said supporting or carrying means providing a housing with an opening for the boring tool, and means is provided in the housing to advance the tool from the housing through the opening in a direction at an angle to the path of travel of the housing on being inserted in the inaccessible hole.
(1) Note. For the meaning of "inaccessible hole", see the class definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, and the search there noted for tool advance guides.
SEE OR SEARCH CLASS
166, Wells, 100, for lateral probes sealed against a well wall which have similar type structure.
